A mechanical wave carries energy from one place to another through the

be subject to a force andchange its motion

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

snell's law

refractve index = sin incidence / sin refraction